On Wed, 31 Oct 2012 16:54:07 +0800 chao bi <chao.bi@xxxxxxxxx> wrote: > > This patch is to implement following 2 places to avoid potential > error when IFX6x60 port shutdown: 1) Clear Flag > IFX_SPI_STATE_IO_AVAILABLE to disable data transfer when Modem port > is shutdown; 2) Clear Flag IFX_SPI_STATE_IO_IN_PROGRESS and > IFX_SPI_STATE_IO_READY when reopen port. This is because last port > shutdown may happen when SPI/DMA transfer is in progress, if the last > data transfer is not completed(for example due to modem reset), the > Flag IFX_SPI_STATE_IO_IN_PROGRESS will be set forever, so when IFX > port is activated again, IFX_SPI_STATE_IO_IN_PROGRESS will prevent > transferring data forever. And if don't clear IFX_SPI_STATE_IO_READY, > it may cause one more SPI frame transferring in spit there is not > data need to be transfer. > > cc: liu chuansheng <chuansheng.liu@xxxxxxxxx> > cc: Chen Jun <jun.d.chen@xxxxxxxxx> > Signed-off-by: channing <chao.bi@xxxxxxxxx> Acked-by: Alan Cox <alan@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
